Lucas 5th Wheel Slider Lube is a clean, easy to use solution for the problem of dry 5th wheels and slider rails. This product applies as a thin film and is slicker than grease. It is waterproof which means it will not wash off slider rails on wet roads. Since this product is not a grease it will not leave behind a soap substance after the lubricant is exhausted. Helps to eliminate the greasy mess on chassis and air hoses.